McLaren team principal Martin Whitmarsh is confident his team can produce its best performance of the season at this weekend's Canadian Grand Prix.

The MP4-25 has the most effective F-duct in Formula One, which allows the driver to stall the rear wing and increase his straight-line speed. The Circuit Gilles Villeneuves' long straights put an emphasis on top speed and Whitmarsh believes that will play to the McLaren's strengths.

"We've got a few more development items on the car for this weekend and this is where we ought to be quickest," he told the Vodafone McLaren Mercedes Phone-In. "It's undoubtedly the case at the moment that the Red Bull is very strong in long, high-speed corners. Fortunately the next two grands prix don't feature a lot of those. But of course while we're developing our car we never know what Red Bull, Mercedes and Ferrari are going to turn up with, maybe they'll turn up with a larger step forward than us."

Asked to expand on the developments, Whitmarsh said: "We've got a new front wing again. We had a new front wing as part of the package in Istanbul but that didn't work. We think we've understood that so we've modified it and hopefully that will work. We also have a new rear wing lower element and modifications to the diffuser. So we've got a reasonable aerodynamic package which we hope will take us a few steps forward."

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